Francisque david



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ilNiTnb TATESi FRANCISQ UE DAVID, OF ST. ETIENNE, FRANCE;

TENsloN DEVICE FOR LooM-sHuTTLEs;

SPECIFICA'I'ION forming part of Letters Patent No. 613,974, dated November 8, IS

Application filed January 24, 1898. Serial No. 667,'788. (No model.)

To aZZ whom, it may concern- Be it known that I, FRANoIsoUE DAVID, a citizen of the French Republic, and a resident of St. Etienne, in the Department of the Loire, France, have invented a new and Improved Tension Device for Loom-Shuttles, of which the following is a full, clear, and exact description.

My invention relates to tension devices for looms, and has for its obj ect to provide a simple construction for retarding the spool more or less, according as the tension on the thread decreases or increases;

To this end my invention consists of a shuttle having a support or body portion, a spool mounted therein, and a brake normally engaging and retarding the spool, the brake comprising means engaged by the thread as the latter passes from the spool, so that tension on the thread serves to relax the brake.

Other features of the invention will appear from the description and claims following hereinafter.

Reference is to be had to the accompanying drawings, in which- Figure 1 is a plan of a shuttle provided with my improved tension device, and Fig. 2 shows another construction according to my invention.

The shuttle comprises the support or body B, which may be of any usual or approved construction, and the spool or bobbin b, j ournaled in said body. W'ith the spool is adapted to coperate a tension device consisting of a brake having directly or indirectly connected therewithmeans engaged by the thread in such a manner that an increase in the speed and tension of the thread will relax the brake, so that there will be no danger of the thread breaking even if it is very fine.

As shown in Fig. 1, the brake consists of a plate i, set into the body B at cc and normally held against the spool b either by its own elasticity or by a separate springj, likewise secured to the body B and bearing against the brake-plate i. The thread on the spool b, instead of passing directly through the hole o of the shuttle, passes through a ring k, arranged on a guide Zc', adjacent to the hole o, and thence through a loop l, formed on the brake fi, finally passing out through the said hole o. The result is that the thread itself controls the brake and that according to the greater or less tension, which will Vary according to the rate of travel of the shuttle, a retarding action more or less gentle is afforded by the action of the thread on the brake-plate t'. The thread itself will throw off the brake i entirely, so as to do away with all retarding action when the thread is strongly drawn by an increased speed. In this case the spool unwinds without retardation. 'When the speed is slackened, the brake is steadily and progressively applied, so as to give the thread the tension necessary to a good feeding and the obtaining of the best results. As shown in Fig. 2, the brake may be constituted by a bell-crank lever or angular plate fi, pivoted at az' and acted upon by a springj'. The free arm of the plate t' is attached to a small spiral spring r, secured to a ring Z'. A similar spring r', arranged on the other side of the shuttle, is attached thereto at r and is connected witha ring 12. The thread passes first through the before-mentioned ring k, then through the rings Z2 and Z', finally coming out through the hole o. This construction produces the same effect as that shown in Fig. 1. The only advantage it possesses over the form first described resides in the keeping of the brake behind the spool b, where it does not interfere with the usual working of the operators. The difference consists in causing the thread to act indirectly on the brake instead of directly, as in the case of Fig. 1.

I do not confine myself to the shapes or dimensions given on the drawings. Any suitable materials may be used in the construction of the difierent parts forming my invention and this latter may be applied to all kinds of looms. This invention may be applied to looms having any number of shuttles, the diinensions of the constituent parts being varied accordingly.

Having thus fully described my invention, Iclaim as new and desire to secure by Letters Patent- 1. The combination of the-shuttle having an Opening through which the thread passes out, the spool mounted in the shuttle, Ithe spring-actuated brake normally eng'aging and retarding the spool, a loop on the brake, and a ring located on the shuttle adjacent to the said Opening, the threadv passing from the IOO spool to the said ring, then to the loop on the brake and finally out through the Opening in the shuttle.

2. In a shuttle, the combination With a sup port or body portion, of a spool monnted therein, and a brake normally engaging and retarding the spool, the brake being mounted to swing in a plane extending longitndinally of the spool, and means connected With the brake to move in unison therewith, and engaged by the thread as the thread passes from the spool, so that tension on the thread serves to relax the brake.

3. In a shuttle, the combination With a support or body portion, of a spool mounted therein, a brake carried by the support or FRANOISQUE DAVID. vitnesses:

ALEXANDRE PIERRE'T, ANToINE BRUNOT.r 

